| D.A.B. Clubs Limited | Financial services | 2008 |
| Dale Brown Enterprises Ltd | Financial services | 2020 |
| Daltech IT Consulting Ltd | Information & communication | 2018 |
| Darren Broom Limited | Construction | 2010 |
| DB Lifting Ltd | Construction | 2026 |
| Devils Martial Arts Limited | Arts & recreation | 2014 |
| Digital Systems UK (South & West Wales) Limited | Administrative & support | 2002 |
| Digital Systems UK Limited | Administrative & support | 2004 |
| Direct Kitchen Doors Online Limited | Wholesale & retail | 2022 |
| DMP Asset Management Ltd | Real estate | 2025 |
| Dolly's Mixtures Direct Ltd | Wholesale & retail | 2018 |
| Downing and Clarke Ltd | Construction | 2020 |
| DR Butler Psychological Services Limited | Other services | 2024 |
| Dragon Flame Wood Fired Pizza Ltd | Wholesale & retail | 2026 |
| Dragon Roofing & Cladding Ltd | Construction | 2014 |
| DRB Multi Limited | Construction | 2023 |
| Drulight Limited | Manufacturing | 1976 |
| Dynamic Waste Solutions Ltd | Manufacturing | 2020 |
| E C Electronics Limited | Manufacturing | 1998 |
| E2E Project Solutions Limited | Information & communication | 2014 |
| Ebbw Flow Plumbing Ltd | Construction | 2026 |
| Ecoji One Ltd | Hospitality | 2026 |
| Eden Nursery Ltd | Health & social care | 2020 |
| El-Sa Haulage Ltd | Transport & logistics | 2019 |
| Elevate by Christina Harrhy Ltd | Professional & scientific | 2025 |
| Elite Network Systems Ltd | Information & communication | 2024 |
| Elite Rendering Systems Ltd | Construction | 2013 |
| Elite Vehicles Direct Ltd | Wholesale & retail | 2017 |
| Energy Hub (South Wales) Limited | Construction | 2021 |
| Energy Hub Group Limited | Financial services | 2022 |
| Expertest W Ltd | Other services | 2023 |
| Ezia Cleaning Company Ltd | Extraterritorial | 2024 |
| F-Cus Family Ltd | Wholesale & retail | 2023 |
| Fasthaul Ltd | Wholesale & retail | 2025 |
| FAV Group Ltd | Real estate | 2024 |
| Feed a Field Hygiene Limited | Wholesale & retail | 2023 |
| Fifihealthlife Ltd | Wholesale & retail | 2025 |
| Fire Safety Protect UK Ltd | Public administration | 2020 |
| First Choice Van Services Ltd | Transport & logistics | 2025 |
| Fixland Handyman Services Ltd | Construction | 2020 |
| Flame Protect UK Limited | Administrative & support | 2013 |
| Fletcher Consulting Ltd | Real estate | 2022 |
| Flying Keys Lettings Limited | Real estate | 2023 |
| Flying Keys Ltd | Real estate | 2020 |
| Formaction Limited | Real estate | 1997 |
| Four Seasons Entertainment Ltd | Arts & recreation | 2011 |
| Fourfront Properties Ltd | Real estate | 2025 |
| G & J Assets Ltd | Hospitality | 2025 |
| G L Brickwork Ltd | Construction | 2019 |
| G S G Solutions UK Limited | Administrative & support | 2006 |
| G&D Painting and Decorating Ltd | Construction | 2026 |
| Gain Nutrition Ltd | Manufacturing | 2020 |
| Gallier Upvc Limited | Construction | 2006 |
| Ganea LUX Star Limited | Wholesale & retail | 2025 |
| GAS Tech (Wales) Limited | Construction | 2011 |
| GAY & Hunt Limited | Wholesale & retail | 2006 |
| GG WOK Limited | Hospitality | 2024 |
| Giants Burger Bar Limited | Hospitality | 2017 |
| Glanynant Properties Ltd | Real estate | 2019 |
| Glanynant Trading Ltd | Professional & scientific | 2019 |
| Global Laser Solutions Ltd | Manufacturing | 2025 |
| GMG Haulage Limited | Transport & logistics | 2023 |
| GN Sports Global Limited | Arts & recreation | 2025 |
| Go WOK 88 Limited | Hospitality | 2024 |
| GR Masters Ltd | Construction | 2017 |
| Gratos Safety Ltd | Professional & scientific | 2025 |
| Green Room Power Limited | Administrative & support | 2017 |
| GSC Healthcare Limited | Health & social care | 2019 |
| H S Brar Limited | Construction | 2017 |
| Hapgood QS Services Ltd. | Professional & scientific | 2016 |
| Harlez Property Limited | Real estate | 2025 |
| Haven Developments (Blaina) Ltd | Construction | 2021 |
| Haven Finance Limited | Professional & scientific | 2023 |
| Heardwell Holdings Limited | Real estate | 2026 |
| Heathbridge Properties Limited | Professional & scientific | 1981 |
| Helen Vowles Ltd | Health & social care | 2009 |
| Henley's BUS Services Limited | Transport & logistics | 1953 |
| High Tech Scaffolding Limited | Construction | 2022 |
| Hillbury Hire Ltd | Administrative & support | 2025 |
| HIT Community CIC | Education | 2024 |
| Hoho Chinese Ltd | Hospitality | 2025 |
| Holloways Travel Ltd | Administrative & support | 2025 |
| Hootscorp Limited | Arts & recreation | 2026 |
| Inch Blue Holdings Limited | Manufacturing | 2024 |
| Inch Blue Limited | Manufacturing | 1995 |
| Infinity Fixings Ltd | Professional & scientific | 2019 |
| Inkling London Limited | Professional & scientific | 2012 |
| Inklusive Arts Ltd | Other services | 2021 |
| Innovative Product Suppliers Ltd | Wholesale & retail | 2016 |
| Insurgo Holdings Limited | Financial services | 2015 |
| Insurgo Limited | Extraterritorial | 2019 |
| Insurgo Media Services Limited | Information & communication | 2009 |
| Intelligent Data & Tape Solutions Limited | Information & communication | 2017 |
| Into the Limelight Limited | Administrative & support | 2009 |
| Investgative Analysis Ltd | Administrative & support | 2011 |
| Invu Managment Ltd | Professional & scientific | 2024 |
| J & a Rentals Ltd | Real estate | 2023 |
| J Radford Advisory Ltd | Administrative & support | 2025 |
| J. M. Carpanini Limited | Real estate | 2005 |
| Jaer Property Co Limited | Construction | 2025 |